fix: improve maintenance and synchronize live conversations

backend/tests/service/test_lead_capture_service.py

@@ -20,7 +20,7 @@ from uuid import uuid4
 from app.models.customer import Customer, LeadStage
 from app.models.session_to_agent import SessionStatus, SessionToAgent
 from app.services.conversation_token import VERIFIED_SCOPE
-from app.models.lead_capture import LeadCaptureConfig, LeadCaptureResponse
+from app.models.lead_capture import LeadCaptureConfig
 from app.services.lead_capture import (
     has_captured_lead, record_lead_capture, _valid_email,
 )